Obscure rays
(Opt.) | those rays which are not luminous or visible, and which in the spectrum are beyond the limits of the visible portion. |
See also: Obscure
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
(Opt.) | those rays which are not luminous or visible, and which in the spectrum are beyond the limits of the visible portion. |
See also: Obscure